Through a week's electrician practice, I have a certain perceptual and rational understanding of the connection and debugging of electrical components and circuits, which lays a good foundation for studying electrician technology courses in the future. At the same time, the internship has enabled me to acquire the design and practical wiring skills of automatic control circuits, cultivate the ability to integrate theory with practice, improve the ability to analyze and solve problems, and enhance the ability to work independently. The most important thing is to cultivate team spirit, discuss with other students and make progress together.

Details are as follows:

1. Familiar with the use, maintenance and repair of common hand tools.

2. Basically master the circuit connection method, and be able to independently complete the connection of simple circuits.

3. Be familiar with the steps, methods and technological processes of control circuit board design, and be able to design and manufacture the control circuit board according to the circuit schematic diagram and the physical objects of electrical components.

4. Familiar with the category, model, specification, performance and application scope of common electrical components.

5. Be able to correctly identify and select common electrical components and skillfully use digital multimeter.

6. Understand the connection, debugging and maintenance methods of electrical components.

Internship content:

1. Watch the video about the internship, grasp the internship as a whole, and clarify the purpose and significance of the internship; Explain the types, models, application scope and methods of electrical components and how to correctly select components.

2. Explain the design requirements, methods and principles of the control circuit;

3. Distribution and inventory tools; Explain how to use tools to test components; Explain the operation methods and precautions of line connection;

4. Assemble, connect and debug the automatic control circuit; Trial operation, defense and grading

5. Disassemble the automatic control circuit, tidy up the desktop and floor, and clean it up.

6. Write an internship report

Practical experience and understanding:

Understanding of AC Contactor

AC contactors are widely used as power switches and control circuits. It uses the main contact to open and close the circuit, and uses the auxiliary contact to execute the control instruction. The main contact generally has only normally open contacts, and the auxiliary contact has two pairs of normally open and normally closed contacts. Small contactors are often used as intermediate relays to work with the main circuit.

The contact of AC contactor is made of silver-tungsten alloy, which has good conductivity and high temperature ablation resistance. Its action power comes from AC electromagnet, and it consists of two "mountain" shaped young silicon steel sheets, one of which is fixed, with a coil on it, and various working voltages to choose from. In order to stabilize the magnetic force, a short-circuit ring is added to the attractive surface of the iron core. After the AC contactor is cut off, it is reset by the spring. The other half is a moving iron core with the same structure as the fixed iron core, which is used to drive the opening and closing of the main contact and the auxiliary contact.

Understanding of intermediate relay

Intermediate relay is a special contactor (i.e. switch). It has a normally closed contact above and a normally open contact below. When the coil is energized, the normally closed contact above is separated by electromagnetic force, and the normally open contact below is closed. It is used to transmit intermediate signals in the control circuit.

The structure and principle of intermediate relay are basically the same as AC contactor, and the main difference with contactor is that the main contact of contactor can pass large current, while the contact of intermediate relay can only pass small current. So it can only be used in the control circuit.

Practical experience of connecting automatic control circuit;

In the one-week internship, one of the most challenging exercises for my hands-on ability is connecting circuits. For me, this is undoubtedly a new knowledge, not only a challenge, but also a lot of useful knowledge. This internship is the one I am most interested in, because I like disassembly since I was a child. Summarizing this internship, I feel that I am sometimes careless. At the beginning of testing electrical components, due to carelessness, the damaged components were mistakenly detected as normal components, which led to reconnection and wasted a lot of time. In the process of connecting components, the connection between components is not planned in advance, which leads to the long-distance detour of wiring on the circuit board, which not only wastes materials, but also makes the circuit board look messy. But it is gratifying that the connector of the line I connected reached the standard of "like dew without dew" put forward by the teacher when explaining. In this internship, I understand the importance of being careful. At the same time, I also understand that my hands-on ability is still insufficient and I am not qualified for future work under such circumstances. Therefore, in the future study process, I will try my best to integrate theory with practice, pay attention to training my hands-on ability, and let myself have certain confidence and confidence in my future work.

abstract

Generally speaking, I am very interested in this course.

First, I have been interested in this kind of small production since I was a child. At that time, I didn't know how to connect and assemble things, but I liked to take things apart and put them in, but in this way, this thing was scrapped. The current electrician practice class is to learn how to "put things back". Every step I take, I am as happy as a child and have a sense of accomplishment.

Second, the characteristics of electrical and electronic practice are that students do it themselves, master certain operational skills, and design, make, assemble and debug themselves. It organically combines basic skills training, basic technological knowledge and innovation enlightenment to cultivate our practical ability and innovative spirit. As a college student in the information age and a highly skilled person trained by the country, it is not enough to operate the mouse only. Basic hands-on ability is the foundation and necessary condition of all work and creation.

After a week's study, I feel that I have gained something in the following aspects:

First of all, have a preliminary and systematic understanding of the theory of electrical technology. Learned the design, production and process flow of control circuit board diagram, as well as the connection skills of electrical components. This knowledge is not only effective in the classroom, but also of great guiding significance for studying electrical technology courses in the future, and also has practical significance in daily life.

Second, it is a great exercise for your practical ability. Experience is the mother of wisdom. Throughout the ages, all inventions have been tested by practice. If the hands-on ability is not enough, you can talk about making achievements in future scientific research, especially experimental research. During the internship, I exercised my hands-on ability and improved my ability to solve problems. For example, when assembling and debugging the control circuit, the spacing between several components was very small, and the wiring that was accidentally connected was broken, but I still completed the task. Finally, I would like to thank all the teachers and classmates who helped me during my internship.

Suggestion:

1. In this internship, there are too few tools (such as multimeters), and it often happens that several groups of people use one tool. It is suggested that the number of tools can be increased in the future;

2. It is suggested to separate the faulty instruments from the trouble-free instruments in the instrument storage cabinet to avoid unnecessary troubles.